Attempts toward the Synthesis of the Peptaibol Antiamoebin by Using the ‘Azirine/Oxazolone Method’
作者:Pia Blaser、Werner Altherr、Anthony Linden、Heinz Heimgartner
DOI:10.1002/cbdv.201200386
日期:2013.5
introduced by the ‘azirine/oxazolone method’, in which amino or peptide acids are coupled with the corresponding 2H‐azirin‐3‐amines, followed by selective hydrolysis of the terminal amide bond. The amino acids Hyp and Gln were introduced as Z‐protected4) (2S,4R)‐4‐(tert‐butoxy)proline (19) and methyl N‐[bis(4‐methoxyphenyl)methyl]glutamine (26). Coupling of peptide segments was achieved via the ‘mixed anhydride’
peptaibol 抗生素抗阿米巴蛋白 I 的两个片段,即九肽 Ac-Phe-Aib-Aib-Aib-D,L-Iva-Gly-Leu-Aib-Aib-OH (15 ) 和七肽 Z-Hyp-Gln-D,L-Iva-Hyp-Aib-Pro-Pheol (34),已制备为含有 D,L-Iva 的差向异构体的混合物。所有 α,α-二取代 α-氨基酸均通过“氮丙啶/恶唑酮方法”引入,其中氨基或肽酸与相应的 2H-氮丙啶-3-胺偶联,然后选择性水解末端酰胺键。氨基酸 Hyp 和 Gln 以 Z-protected4) (2S,4R)-4-(叔丁氧基)脯氨酸 (19) 和甲基 N-[双(4-甲氧基苯基)甲基]谷氨酰胺 (26) 的形式引入。肽段的偶联是通过“混合酸酐”方法、DCC/HOBt 或 TBTU/HOBt 策略实现的。